User's Manual

special situation the upgrade failed, the system won't be broken down, it could return
back to the program code before the upgradation following the below step:
In the power cut off status, press the F1 and F2 key simultaneously, then plug the
power in, the screen would turn black, then appear the yellow font. When the first line
displaying: Reply_original_program...., it indicates that could restore the original
backup program. Then release F1, F2 , it would restore to the former system after the
backup finished. At this time it could download the new program in the correct
manner again.
Remark：This backup program could be used only after the upgradation of the
new program, or the operation won't be valid.
3.3
8